Put butter in pan and melt over medium heat, add cocoa powder, water and salt and heat till butter is melted and everything is incorporated (use a whisk)

Make a well into the flour mixture pour in 1/2 of the cocoa mixture and whisk. Add remaining chocolate mixture and continue to stir

Add one egg at a time and then the vanilla and finally the sour cream. Mix well with a whisk and pour into a oil sprayed silicon bundt pan preferably. Put the bundt pan on a cookie sheet and put in preheated oven